# encoding: utf-8


etxt = input("请输入加密文本:")

for p in etxt:			
	if 'a' <= p <= 'z':
		print(chr(ord('a') + (ord(p) - ord('a') - 3) % 26), end='')
	elif 'A' <= p <= 'Z':
		print(chr(ord('A') + (ord(p) - ord('A') - 3) % 26), end='')
	else:
		print(p, end='')
		